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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac28613972a635a88b4897d5b3636dd4379296f9ca0c297da7b3961383e8930' 
  AND token = 'VoaJUpFojbygfwQueJVL7fI8do7GsfOGRP2Q+eya3lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}